Compressed air lighting?

So I've got this civilization that doesn't have electricity, but does have municipal power distribution via compressed air lines.

Now, you can do a lot of useful things with compressed air. Even in the real world, compressed-air tools are fairly common. You can even use it for heating, via vortex tubes (not terribly efficient) or heat pumps (much more efficient), although suggestions for better ways of providing heat via compressed air would be appreciated.

But what I can't figure out is, is there any way practical way to produce light directly from compressed air power? Or are these people just going to be stuck using Victorian-style gas lamps, with separate municipal supplies for compressed air and natural gas?

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Compressed air lighting?

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